Find exe and apply with option

i need find a exe (frminst.exe) and apply a command "frminst.exe" with options.

I think that i do several etapes :
1 => "system search" to my exe on [ProgramFilesFolder]
"Folder Path, by searching for a specific file"
File name => "Frminst.exe"
A full path => "[ProgramFilesFolder]"
Maximum number of subfolders to search => 1
Store the Value in this property => "FRMINST"
Additional Option : "Store the value in the property and use the property in an install condition"
In the window Condition Builder => i don't know what i have to do ...

2 => "custom action" to apply my option to my exe...
I think that i have to choose "New EXE" / " Path in property Value" but I don't know how use my exe...